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Thread: Losses within scanner

  1. #11
    Join Date
    Nov 2007
    Location
    SoCal / San Salvador / NY
    Posts
    4,018

    Lightbulb

    Hey Carm... here's the 'skinny': (with complimentary 'spellcheck' fixes!)

    Quote Originally Posted by Buffo View Post
    If you're losing 40% across your scanners, something is seriously wrong.
    Quote Originally Posted by mliptack View Post
    First make sure that you are not measuring any IR light coming from your green or blue
    Quote Originally Posted by Dr Laser View Post
    Check your galvos and make sure you install them right. Coating is on one side so make sure this side is the one reflecting!
    IF, after re-checking with these fine suggestions, you think that your galvo mirrors ARE bad - try sending a beam directly thru one of the galvo mirrors at 0 deg. incidence-angle (straight on) and see- VISIBLY (not metered)- if you get any significant (>5 mW out-of 100mW) 'pass-thru', - then repeat, with the galvo mirror at 45 deg. (careful with reflections! ‹(•¿x)› doh!) and if you are seeing a LOT of pass-thru (like say 30mW out-of 100mW), well, time to ask for replacement mirrors...

    Also, try test again, MEASURING results reflecting OFF galvo mirror - ie: say coming out of laser X, you directly-measure 100mW (or whatever your powers are) of green, but off galvo-mirror bounce-tests, it is 40mW (and there is NOT 60mW of green VISIBLY-passing thru the galvo mirror out into the room - especially at 45 deg.), well, then time to discuss 'rated power @ Xnm' vs what you are measuring off those bounces, with the people that sold you the DPSS...

    IF after these tests, you feel that the galvo mirrors ARE truly bad, AND your galvo manufacturer does not/can not help you (out of warranty, don't sell replacement mirs, etc), check with Fred or Amanda at One Stop Laser Shop (PL member "OSLS") - they have many types of galvo-replacement mirrors, and if your shafts can take a 1mm-thick mirror, they sell the best aerospace-grade broadband dielectric mirror we've ever used...

    Hope this helps! ... peace.

    - J
    ....and armed only with his trusty 21 Zorgawatt KTiOPO4...

  2. #12
    Join Date
    Dec 2006
    Location
    Pflugerville, TX, USA
    Posts
    1,977

    Default

    Thanks for all of the tips. I'm going to try some different things as I have time.

  3. #13
    Join Date
    Oct 2006
    Location
    Central Florida
    Posts
    7,067

    Lightbulb

    Make sure your dichros are all at 45 degree angles to the beams also...
    Love, peace, and grease,

    allthat... aka: aaron@pangolin

  4. #14
    Join Date
    Dec 2006
    Location
    Essex, UK
    Posts
    8,648

    Default

    ok done a few tests with my green and blue dichro from edmund and my dt40 which have brand new mirrors on them.

    im loosing hardly anything, a few mw.

    but something i noticed my green pointer is producing 37mw and im loosing 17mw passing through the blue dichro. this seems a little high to me?

    the green looses only a few mw when passing the red dichro.

    also with the new mirrors im only loosing a few mw on the galvo's, nothing major

    so all in all good results for me
    Eat Sleep Lase Repeat

  5. #15
    Join Date
    Apr 2007
    Location
    Leicestershire, UK
    Posts
    137

    Default

    Could it be that your measuring some IR leakage that the galvo mirrors don't reflect?

  6. #16
    Join Date
    Dec 2006
    Location
    Essex, UK
    Posts
    8,648

    Default

    its a new wicked pointer, so should have an ir filter
    Eat Sleep Lase Repeat

  7. #17
    Join Date
    May 2007
    Location
    Milwaukee WI
    Posts
    1,355

    Default

    yes keyword SHOULD

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